Deutsch
 
Hilfe Datenschutzhinweis Impressum
  DetailsucheBrowse

Datensatz

DATENSATZ AKTIONENEXPORT
  Oxidation of amorphous Ni–Zr alloys studied by XPS, UPS, ISS and XRD

Song, Z., Bao, X., Wild, U., Muhler, M., & Ertl, G. (1998). Oxidation of amorphous Ni–Zr alloys studied by XPS, UPS, ISS and XRD. Applied Surface Science, 134(1-4), 31-38. doi:10.1016/S0169-4332(98)00249-9.

Item is

Basisdaten

einblenden: ausblenden:
Genre: Zeitschriftenartikel

Externe Referenzen

einblenden:

Urheber

einblenden:
ausblenden:
 Urheber:
Song, Z.1, Autor
Bao, X.1, Autor
Wild, Ute2, Autor           
Muhler, Martin2, Autor           
Ertl, Gerhard2, Autor           
Affiliations:
1Dalian Institute of Chemical Physics, Dalian, China, ou_persistent22              
2Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              

Inhalt

einblenden:
ausblenden:
Schlagwörter: -
 Zusammenfassung: Amorphous Ni36Zr64 and Ni24Zr76 alloys were treated under conditions close to those used for activating Ni–Zr alloys in catalytic reactions. The composition and the structure of the surface region were investigated by X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS), ion scattering spectroscopy (ISS) and X-ray diffraction (XRD). The results show that exposing the amorphous alloys to 500 mbar O2 at 523 K led to oxidized surfaces consisting of zirconia and different oxidic nickel species. On the oxidized Ni24Zr76 surface, only small amounts of NiO and Ni2O3 were found, while Ni2O3 was detected as the major Ni-containing species on the oxidized Ni36Zr64 surface. Oxidation of Ni in the alloys appeared to be inhibited by the presence of metallic Zr and started only after complete oxidation of the surrounding Zr. Annealing the oxidized alloys to 773 K led to a reduction of the surface oxides. The liberated oxygen atoms presumably diffused into the bulk, releasing metallic Ni. At the topmost layer, zirconia was reduced by carbon atoms originating from the bulk to form a ZrC-like surface compound. The exchange of Ni and Zr atoms between the surface and the bulk was enhanced by the oxidation and the annealing. The preferential oxidation of zirconium, which attracts Zr atoms from the bulk to the surface, provides the driving force for such processes.

Details

einblenden:
ausblenden:
Sprache(n): eng - English
 Datum: 1997-11-131998-04-051998-09
 Publikationsstatus: Erschienen
 Seiten: 8
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1016/S0169-4332(98)00249-9
 Art des Abschluß: -

Veranstaltung

einblenden:

Entscheidung

einblenden:

Projektinformation

einblenden:

Quelle 1

einblenden:
ausblenden:
Titel: Applied Surface Science
  Kurztitel : Appl. Surf. Sci.
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: Amsterdam : Elsevier B.V.
Seiten: 8 Band / Heft: 134 (1-4) Artikelnummer: - Start- / Endseite: 31 - 38 Identifikator: ISSN: 0169-4332
CoNE: https://pure.mpg.de/cone/journals/resource/954928576736